Radiator Oil Cooler Adapter Fitting

[L31MaxExpress]

It's been a year since the last entry here. How did things turn out?

I have a '95 Gvan with the oil cooler in the radiator and a damaged factory upper oil cooler hard line that I believe has similar M20x1.5 fittings at the radiator. The upper hard line was discontinued by GM and I have not been able to find a used one at salvage yards so I have been contemplating different replacement options. I ordered a pair of new Delco lower hard lines that have the same fitting at the radiator and 1/2" OD aluminum tubing so I could have an extra one to cannibalize for the fittings and possibly several inches of the hard line that has the male O-ring tube end (whatever they are called) but using that would likely require a compression fitting and I'm not sure that's the route I want to go.

The fitting manufacturers basically all scoffed this fitting off as being irrelevant.

I ended up using oil cooler lines for a GMT400 Vortec 350 and the maching quick disconnect on the aftermarket Hayden oil cooler adapter housing on the block on my 87 G20 with a L31 swapped into it. Been leak free thus far. The Hayden adapter had larger threads than the OE fitting, but a pair of brass pipe threaded bushings reaolved that issue.

 

[GoToGuy]

Are still trying to experiment with different size fittings?
If some would make this fitting it would be great. As such I have only found it available in 18 mm, not 20 mm yet. With a -8 on the other end.

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[Zayne8]

The fitting manufacturers basically all scoffed this fitting off as being irrelevant.

I ended up using oil cooler lines for a GMT400 Vortec 350 and the maching quick disconnect on the aftermarket Hayden oil cooler adapter housing on the block on my 87 G20 with a L31 swapped into it. Been leak free thus far. The Hayden adapter had larger threads than the OE fitting, but a pair of brass pipe threaded bushings reaolved that issue.

I got lucky yesterday and found a new arrival that had the factory oil cooler lines intact and was able to pull the upper line without twisting the line. Cleaned it up to swap in. I needed that score as this is a time-sensitive repair but I will be revisiting this issue down the road.

 

[GoToGuy]

So the rad side has the bump with o ring. What is the fitting on the engine side?

 

[caw_86]

ok, so i have come up with my final solution. i ordered my new radiator from ecp cooling.

1995 - 1998 Chevy Truck Aluminum Radiator Upgrade - 40" WIDTH - Dual 1

1995 – 1998 Chevy Truck Aluminum Radiator Upgrade – 40″ WIDTH – Dual 16″ HPX Fans This is our all new aluminum radiator for the 1988 - 1998 Chevy trucks that use the 34" wide core radiator (40" overall width) with an overall height of 19". This WILL NOT fit trucks that use the radiator with a...

ecp-radiator.com

I called and asked them to build it with 1/2 npt bungs for the oil cooler side. they said no problem for this model, it was an extra $100 to make the modification
now i will be able to plug in a 1/2npt-AN8 fitting without having to jump through a bunch of hoops to connect oil cooler lines that wont leak.

if you want to do the same, ask for Anthony Bustillos

 

[caw_86]

So here it is. It looks like they just welded 1/2npt bungs over the factory fitting

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[SNCTMPL]

So here it is. It looks like they just welded 1/2npt bungs over the factory fitting

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What size lines are you going to run?

 

[caw_86]

What size lines are you going to run?

8AN

 

[SNCTMPL]

That’s what I’m doing. It took me a while, but I finally found some 18mm x 1.5 o ring by 8an adapters and they fit my new radiator perfectly.

 

[GoToGuy]

The 18 mm fit ? and that's the stock radiator? You didn't say what radiator you have? Their are many sources of 18 mm or smaller. 18 mm male X -10, 18 mm x -6, and so on. .
The magic adapter that's not produced is 20x1.5 mm, male with a dash 8 male. .